The costs for hosting your own Revive Adserver might be negligible, especially if you have plenty of disk space and bandwidth left in your hosting plan. If you know how to install a PHP/MySQL application, and are willing to follow the guidance in the installation instructions, you won’t be needing any help, which would provide great flexibility. You will need to take care of backups and upgrades yourself. When your site’s traffic begins to grow, so will the ad server, and that might result in a need for scaling. Setting up the ad server with scalability in mind is always a good idea. Hosting your own ad server does mean you will also be responsible for problem solving, recovering from failures, and generally will mean that you’re the one worrying about it. So peace of mind in this scenario will be low.